1 // SPDX-License-Identifier: GPL-2.0-or-later
2 /*
3 * sam9g20_wm8731 -- SoC audio for AT91SAM9G20-based
4 * ATMEL AT91SAM9G20ek board.
5 *
6 * Copyright (C) 2005 SAN People
7 * Copyright (C) 2008 Atmel
8 *
9 * Authors: Sedji Gaouaou <sedji.gaouaou@atmel.com>
10 *
11 * Based on ati_b1_wm8731.c by:
12 * Frank Mandarino <fmandarino@endrelia.com>
13 * Copyright 2006 Endrelia Technologies Inc.
14 * Based on corgi.c by:
15 * Copyright 2005 Wolfson Microelectronics PLC.
16 * Copyright 2005 Openedhand Ltd.
17 */
18
19 #include <linux/module.h>
20 #include <linux/moduleparam.h>
21 #include <linux/kernel.h>
22 #include <linux/clk.h>
23 #include <linux/timer.h>
24 #include <linux/interrupt.h>
25 #include <linux/platform_device.h>
26 #include <linux/of.h>
27
28 #include <linux/atmel-ssc.h>
29
30 #include <sound/core.h>
31 #include <sound/pcm.h>
32 #include <sound/pcm_params.h>
33 #include <sound/soc.h>
34
35 #include "../codecs/wm8731.h"
36 #include "atmel-pcm.h"
37 #include "atmel_ssc_dai.h"
38
39 #define MCLK_RATE 12000000
40
41 /*
42 * As shipped the board does not have inputs. However, it is relatively
43 * straightforward to modify the board to hook them up so support is left
44 * in the driver.
45 */
46 #undef ENABLE_MIC_INPUT
47
48 static const struct snd_soc_dapm_widget at91sam9g20ek_dapm_widgets[] = {
49 SND_SOC_DAPM_MIC("Int Mic", NULL),
50 SND_SOC_DAPM_SPK("Ext Spk", NULL),
51 };
52
53 static const struct snd_soc_dapm_route intercon[] = {
54
55 /* speaker connected to LHPOUT/RHPOUT */
56 {"Ext Spk", NULL, "LHPOUT"},
57 {"Ext Spk", NULL, "RHPOUT"},
58
59 /* mic is connected to Mic Jack, with WM8731 Mic Bias */
60 {"MICIN", NULL, "Mic Bias"},
61 {"Mic Bias", NULL, "Int Mic"},
62 };
63
64 /*
65 * Logic for a wm8731 as connected on a at91sam9g20ek board.
66 */
at91sam9g20ek_wm8731_init(struct snd_soc_pcm_runtime * rtd)67 static int at91sam9g20ek_wm8731_init(struct snd_soc_pcm_runtime *rtd)
68 {
69 struct snd_soc_dai *codec_dai = snd_soc_rtd_to_codec(rtd, 0);
70 struct device *dev = rtd->dev;
71 int ret;
72
73 dev_dbg(dev, "%s called\n", __func__);
74
75 ret = snd_soc_dai_set_sysclk(codec_dai, WM8731_SYSCLK_MCLK,
76 MCLK_RATE, SND_SOC_CLOCK_IN);
77 if (ret < 0) {
78 dev_err(dev, "Failed to set WM8731 SYSCLK: %d\n", ret);
79 return ret;
80 }
81
82 #ifndef ENABLE_MIC_INPUT
83 snd_soc_dapm_nc_pin(&rtd->card->dapm, "Int Mic");
84 #endif
85
86 return 0;
87 }
88
89 SND_SOC_DAILINK_DEFS(pcm,
90 DAILINK_COMP_ARRAY(COMP_CPU("at91rm9200_ssc.0")),
91 DAILINK_COMP_ARRAY(COMP_CODEC("wm8731.0-001b", "wm8731-hifi")),
92 DAILINK_COMP_ARRAY(COMP_PLATFORM("at91rm9200_ssc.0")));
93
94 static struct snd_soc_dai_link at91sam9g20ek_dai = {
95 .name = "WM8731",
96 .stream_name = "WM8731 PCM",
97 .init = at91sam9g20ek_wm8731_init,
98 .dai_fmt = SND_SOC_DAIFMT_I2S | SND_SOC_DAIFMT_NB_NF |
99 SND_SOC_DAIFMT_CBP_CFP,
100 #ifndef ENABLE_MIC_INPUT
101 .playback_only = true,
102 #endif
103 SND_SOC_DAILINK_REG(pcm),
104 };
105
106 static struct snd_soc_card snd_soc_at91sam9g20ek = {
107 .name = "AT91SAMG20-EK",
108 .owner = THIS_MODULE,
109 .dai_link = &at91sam9g20ek_dai,
110 .num_links = 1,
111
112 .dapm_widgets = at91sam9g20ek_dapm_widgets,
113 .num_dapm_widgets = ARRAY_SIZE(at91sam9g20ek_dapm_widgets),
114 .dapm_routes = intercon,
115 .num_dapm_routes = ARRAY_SIZE(intercon),
116 .fully_routed = true,
117 };
118
at91sam9g20ek_audio_probe(struct platform_device * pdev)119 static int at91sam9g20ek_audio_probe(struct platform_device *pdev)
120 {
121 struct device_node *np = pdev->dev.of_node;
122 struct device_node *codec_np, *cpu_np;
123 struct snd_soc_card *card = &snd_soc_at91sam9g20ek;
124 int ret;
125
126 if (!np) {
127 return -ENODEV;
128 }
129
130 ret = atmel_ssc_set_audio(0);
131 if (ret) {
132 dev_err(&pdev->dev, "ssc channel is not valid: %d\n", ret);
133 return ret;
134 }
135
136 card->dev = &pdev->dev;
137
138 /* Parse device node info */
139 ret = snd_soc_of_parse_card_name(card, "atmel,model");
140 if (ret)
141 goto err;
142
143 ret = snd_soc_of_parse_audio_routing(card,
144 "atmel,audio-routing");
145 if (ret)
146 goto err;
147
148 /* Parse codec info */
149 at91sam9g20ek_dai.codecs->name = NULL;
150 codec_np = of_parse_phandle(np, "atmel,audio-codec", 0);
151 if (!codec_np) {
152 dev_err(&pdev->dev, "codec info missing\n");
153 ret = -EINVAL;
154 goto err;
155 }
156 at91sam9g20ek_dai.codecs->of_node = codec_np;
157
158 /* Parse dai and platform info */
159 at91sam9g20ek_dai.cpus->dai_name = NULL;
160 at91sam9g20ek_dai.platforms->name = NULL;
161 cpu_np = of_parse_phandle(np, "atmel,ssc-controller", 0);
162 if (!cpu_np) {
163 dev_err(&pdev->dev, "dai and pcm info missing\n");
164 of_node_put(codec_np);
165 ret = -EINVAL;
166 goto err;
167 }
168 at91sam9g20ek_dai.cpus->of_node = cpu_np;
169 at91sam9g20ek_dai.platforms->of_node = cpu_np;
170
171 of_node_put(codec_np);
172 of_node_put(cpu_np);
173
174 ret = snd_soc_register_card(card);
175 if (ret) {
176 dev_err_probe(&pdev->dev, ret,
177 "snd_soc_register_card() failed\n");
178 goto err;
179 }
180
181 return 0;
182
183 err:
184 atmel_ssc_put_audio(0);
185 return ret;
186 }
187
at91sam9g20ek_audio_remove(struct platform_device * pdev)188 static void at91sam9g20ek_audio_remove(struct platform_device *pdev)
189 {
190 struct snd_soc_card *card = platform_get_drvdata(pdev);
191
192 snd_soc_unregister_card(card);
193 atmel_ssc_put_audio(0);
194 }
195
196 #ifdef CONFIG_OF
197 static const struct of_device_id at91sam9g20ek_wm8731_dt_ids[] = {
198 { .compatible = "atmel,at91sam9g20ek-wm8731-audio", },
199 { }
200 };
201 MODULE_DEVICE_TABLE(of, at91sam9g20ek_wm8731_dt_ids);
202 #endif
203
204 static struct platform_driver at91sam9g20ek_audio_driver = {
205 .driver = {
206 .name = "at91sam9g20ek-audio",
207 .of_match_table = of_match_ptr(at91sam9g20ek_wm8731_dt_ids),
208 },
209 .probe = at91sam9g20ek_audio_probe,
210 .remove_new = at91sam9g20ek_audio_remove,
211 };
212
213 module_platform_driver(at91sam9g20ek_audio_driver);
214
215 /* Module information */
216 MODULE_AUTHOR("Sedji Gaouaou <sedji.gaouaou@atmel.com>");
217 MODULE_DESCRIPTION("ALSA SoC AT91SAM9G20EK_WM8731");
218 MODULE_ALIAS("platform:at91sam9g20ek-audio");
219 MODULE_LICENSE("GPL");
220